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The experimental part

1. Determine graduate graph of monochromator by mercury spectrum. For it you must to revolve the monochromator drum until you can see the spectrum line in micrometer eyepiece.

For mercury lamp:

Colour of spectrum line Wavelength, 10-9 ,m
Violet Blue   Light blue   Green Yellow 410,805 434,749 435,833 491,607 502,564 546,073 578,966

 

2. Determine the line position of red, green and blue on monochromator drum of hydrogen spectrum.

3. Determine the wave length of red, green and blue lines of hydrogen spectrum used graduate graph of monochromator.

4. Calculate the Rydberg constant by formula

 

, (11.9)

 

where λmn is wavelength; n = 2 and m = 3 (red), 4 (dark blue), 5 (light blue), 6 (violet).

6. Put down the date of measurements in the table:

 

n2 Colour of line Angle of rotation a monochromator dram Wavelength, l, nm Rydberg constant, Ri, m-1 , m-1
Red        
Dark blue        
Light blue        
Violet        

 

6. Make analysis of the experiment results.


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